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My huawei E1752 dongle is recognised by Ubuntu 13.10, I can set up a mobile broadband connection and the OS tells me I have a network connection to the GSM network. The blue light on the device that indicates a connection is showing. However I have no Internet connection.

The device has previously been working on an Ubuntu for Netbooks machine and is in regular use on a Windows 7 machine.

The only lead I have so far is lsusb is reporting the device as a different model from Huawei. Output (see line 2):

me@MY_PC:~$ lsusb
Bus 002 Device 003: ID 0930:0214 Toshiba Corp. 
Bus 002 Device 006: ID 12d1:1436 Huawei Technologies Co., Ltd. E173 3G Modem (modem-mode)
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 10f1:1a2a Importek Laptop Integrated Webcam
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The common advice for these things seems to be switching the device from USB storage mode to modem-mode, but it seems to be in modem-mode without me having to configure anything.

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